Four-way switches are used any time when more than two switches are needed to control a light. This presentation shows the internal workings of the four-way switch and how it works with three-way switches, allowing a light to be controlled from three different locations. As for the software used, it was something I created for the occasion. When I can't find what I want, I usually will write my own. I was still using Windows... some at this time. I am now 100% Linux OS user now.
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